Acta Optica Sinica, Volume. 30, Issue 4, 949(2010)
Research on Optical Current Transformer Based on the Fiber Bragg Grating
An optical current transformer is constructed by exposing gain mangetostrictive material (GMM)-FBG system to current-induced magnetic field. Ferro-magnetic materials are used to design a loop to constraint and conduct the flux into GMM. The permanent magnetic material is used in loop to establish a bias flux to form a working bias for the system. Finite element method is used to analyze and design the loop structure and the size. Coarse wavelength division multiplexing (CWDM) device is used to demodulate the alternating strain on FBG caused wavelength drift to realize sensing of the current. In the experiment,the maximum current is 186 A and the full scale accuracy is 4.3% when the system workes in linear region by setting the bias in 30 kA/m. Fast Fourier transform algorithm (FFT) is used to analyze the harmonic component of the output signal to evaluate the quality. It is demonstrated that the output signal is not influenced by hysteresis and nonlinear effect of GMM in linear region.
Get Citation
Copy Citation Text
Xiong Yanling, Zhao Hong, Zhang Jian, Zhao Haijun, Wang Shurong. Research on Optical Current Transformer Based on the Fiber Bragg Grating[J]. Acta Optica Sinica, 2010, 30(4): 949
Category: Fiber Optics and Optical Communications
Received: Aug. 2, 2009
Accepted: --
Published Online: Apr. 20, 2010
The Author Email: Yanling Xiong (xyling1964@163.com)